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Blockchain-based cryptocurrencies, facilitating the convenience of payment byproviding a decentralized online solution, have not been widely adopted so fardue to slow confirmation of transactions. Offline delegation offers anefficient way to exchange coins. However, in such an approach, the coins thathave been delegated confront the risk of being spent twice since thedelegator's behaviour cannot be restricted easily on account of the absence ofeffective supervision. Even if a third party can be regarded as a judge betweenthe delegator and delegatee to secure transactions, she still faces the threatof being compromised or providing misleading assure. Moreover, the approachequipped with a third party contradicts the real intention of decentralizedcryptocurrency systems. In this paper, we propose \textit{DelegaCoin}, anoffline delegatable cryptocurrency system to mitigate such an issue. We exploittrusted execution environments (TEEs) as decentralized "virtual agents" toprevent malicious delegation. In DelegaCoin, an owner can delegate his coinsthrough offline-transactions without interacting with the blockchain network. Aformal model and analysis, prototype implementation, and further evaluationdemonstrate that our scheme is provably secure and practically feasible.

An Offline Delegatable Cryptocurrency System